So an effective affiliate marketing program requires some forethought. The terms and conditions have to be tight, especially if the contract agreement is to pay for traffic rather than sales. The potential for fraud in affiliate marketing is a possibility. Unscrupulous affiliates can squat on domain names with misspellings and get a commission for the redirect; they can populate online registration forms with fake or stolen information; they can purchase adwords on search terms the company already ranks high on, and so on. Even if the terms and conditions are clear, an affiliate marketing program requires that someone be monitoring affiliates and enforcing the rules. In exchange for that effort, however, a company can access motivated, creative people to help sell their product or services to the world.
Websites consisting mostly of affiliate links have previously held a negative reputation for underdelivering quality content. In 2005 there were active changes made by Google, where certain websites were labeled as "thin affiliates". Such websites were either removed from Google's index or were relocated within the results page (i.e., moved from the top-most results to a lower position). To avoid this categorization, affiliate marketer webmasters must create quality content on their websites that distinguishes their work from the work of spammers or banner farms, which only contain links leading to merchant sites.